632 lines
21 KiB
PHP
632 lines
21 KiB
PHP
<?php
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/**
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* Password Hashing Class
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*
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* This class implements various mechanisms used to hash passwords
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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* @license LGPL2
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*/
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class PassHash {
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/**
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* Verifies a cleartext password against a crypted hash
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*
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* The method and salt used for the crypted hash is determined automatically,
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* then the clear text password is crypted using the same method. If both hashs
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* match true is is returned else false
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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*
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* @param string $clear Clear-Text password
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* @param string $hash Hash to compare against
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* @return bool
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*/
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function verify_hash($clear, $hash) {
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$method = '';
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$salt = '';
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$magic = '';
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//determine the used method and salt
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$len = strlen($hash);
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if(preg_match('/^\$1\$([^\$]{0,8})\$/', $hash, $m)) {
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$method = 'smd5';
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$salt = $m[1];
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$magic = '1';
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} elseif(preg_match('/^\$apr1\$([^\$]{0,8})\$/', $hash, $m)) {
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$method = 'apr1';
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$salt = $m[1];
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$magic = 'apr1';
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} elseif(preg_match('/^\$P\$(.{31})$/', $hash, $m)) {
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$method = 'pmd5';
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$salt = $m[1];
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$magic = 'P';
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} elseif(preg_match('/^\$H\$(.{31})$/', $hash, $m)) {
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$method = 'pmd5';
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$salt = $m[1];
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$magic = 'H';
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} elseif(preg_match('/^pbkdf2_(\w+?)\$(\d+)\$(.{12})\$/', $hash, $m)) {
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$method = 'djangopbkdf2';
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$magic = array(
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'algo' => $m[1],
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'iter' => $m[2],
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);
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$salt = $m[3];
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} elseif(preg_match('/^sha1\$(.{5})\$/', $hash, $m)) {
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$method = 'djangosha1';
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$salt = $m[1];
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} elseif(preg_match('/^md5\$(.{5})\$/', $hash, $m)) {
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$method = 'djangomd5';
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$salt = $m[1];
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} elseif(preg_match('/^\$2(a|y)\$(.{2})\$/', $hash, $m)) {
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$method = 'bcrypt';
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$salt = $hash;
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} elseif(substr($hash, 0, 6) == '{SSHA}') {
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$method = 'ssha';
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$salt = substr(base64_decode(substr($hash, 6)), 20);
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} elseif(substr($hash, 0, 6) == '{SMD5}') {
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$method = 'lsmd5';
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$salt = substr(base64_decode(substr($hash, 6)), 16);
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} elseif(preg_match('/^:B:(.+?):.{32}$/', $hash, $m)) {
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$method = 'mediawiki';
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$salt = $m[1];
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} elseif(preg_match('/^\$6\$(.+?)\$/', $hash, $m)) {
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$method = 'sha512';
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$salt = $m[1];
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} elseif($len == 32) {
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$method = 'md5';
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} elseif($len == 40) {
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$method = 'sha1';
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} elseif($len == 16) {
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$method = 'mysql';
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} elseif($len == 41 && $hash[0] == '*') {
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$method = 'my411';
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} elseif($len == 34) {
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$method = 'kmd5';
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$salt = $hash;
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} else {
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$method = 'crypt';
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$salt = substr($hash, 0, 2);
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}
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//crypt and compare
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$call = 'hash_'.$method;
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$newhash = $this->$call($clear, $salt, $magic);
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if($newhash === $hash) {
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return true;
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}
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return false;
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}
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/**
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* Create a random salt
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*
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* @param int $len The length of the salt
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* @return string
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*/
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public function gen_salt($len = 32) {
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$salt = '';
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$chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
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for($i = 0; $i < $len; $i++) {
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$salt .= $chars[$this->random(0, 61)];
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}
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return $salt;
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}
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/**
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* Initialize the passed variable with a salt if needed.
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*
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* If $salt is not null, the value is kept, but the lenght restriction is
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* applied (unless, $cut is false).
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*
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* @param string|null &$salt The salt, pass null if you want one generated
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* @param int $len The length of the salt
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* @param bool $cut Apply length restriction to existing salt?
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*/
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public function init_salt(&$salt, $len = 32, $cut = true) {
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if(is_null($salt)) {
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$salt = $this->gen_salt($len);
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$cut = true; // for new hashes we alway apply length restriction
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}
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if(strlen($salt) > $len && $cut) $salt = substr($salt, 0, $len);
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}
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// Password hashing methods follow below
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/**
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* Password hashing method 'smd5'
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*
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* Uses salted MD5 hashs. Salt is 8 bytes long.
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*
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* The same mechanism is used by Apache's 'apr1' method. This will
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* fallback to a implementation in pure PHP if MD5 support is not
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* available in crypt()
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*
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* @author Andreas Gohr <andi@splitbrain.org>
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* @author <mikey_nich at hotmail dot com>
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* @link http://php.net/manual/en/function.crypt.php#73619
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*
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* @param string $clear The clear text to hash
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* @param string $salt The salt to use, null for random
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* @return string Hashed password
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*/
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public function hash_smd5($clear, $salt = null) {
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$this->init_salt($salt, 8);
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if(defined('CRYPT_MD5') && CRYPT_MD5 && $salt !== '') {
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return crypt($clear, '$1$'.$salt.'$');
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} else {
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// Fall back to PHP-only implementation
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return $this->hash_apr1($clear, $salt, '1');
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}
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}
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/**
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* Password hashing method 'lsmd5'
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*
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* Uses salted MD5 hashs. Salt is 8 bytes long.
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*
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* This is the format used by LDAP.
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*
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* @param string $clear The clear text to hash
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* @param string $salt The salt to use, null for random
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* @return string Hashed password
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*/
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public function hash_lsmd5($clear, $salt = null) {
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$this->init_salt($salt, 8);
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return "{SMD5}".base64_encode(md5($clear.$salt, true).$salt);
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}
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/**
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* Password hashing method 'apr1'
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*
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* Uses salted MD5 hashs. Salt is 8 bytes long.
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*
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* This is basically the same as smd1 above, but as used by Apache.
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*
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* @author <mikey_nich at hotmail dot com>
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* @link http://php.net/manual/en/function.crypt.php#73619
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*
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* @param string $clear The clear text to hash
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* @param string $salt The salt to use, null for random
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* @param string $magic The hash identifier (apr1 or 1)
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* @return string Hashed password
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*/
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public function hash_apr1($clear, $salt = null, $magic = 'apr1') {
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$this->init_salt($salt, 8);
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$len = strlen($clear);
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$text = $clear.'$'.$magic.'$'.$salt;
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$bin = pack("H32", md5($clear.$salt.$clear));
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for($i = $len; $i > 0; $i -= 16) {
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$text .= substr($bin, 0, min(16, $i));
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}
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for($i = $len; $i > 0; $i >>= 1) {
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$text .= ($i & 1) ? chr(0) : $clear{0};
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}
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$bin = pack("H32", md5($text));
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for($i = 0; $i < 1000; $i++) {
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$new = ($i & 1) ? $clear : $bin;
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if($i % 3) $new .= $salt;
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if($i % 7) $new .= $clear;
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$new .= ($i & 1) ? $bin : $clear;
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$bin = pack("H32", md5($new));
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}
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$tmp = '';
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for($i = 0; $i < 5; $i++) {
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$k = $i + 6;
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$j = $i + 12;
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if($j == 16) $j = 5;
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$tmp = $bin[$i].$bin[$k].$bin[$j].$tmp;
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}
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$tmp = chr(0).chr(0).$bin[11].$tmp;
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$tmp = strtr(
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strrev(substr(base64_encode($tmp), 2)),
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"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
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"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
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);
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return '$'.$magic.'$'.$salt.'$'.$tmp;
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}
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/**
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* Password hashing method 'md5'
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*
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* Uses MD5 hashs.
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*
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* @param string $clear The clear text to hash
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* @return string Hashed password
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*/
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public function hash_md5($clear) {
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return md5($clear);
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}
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/**
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* Password hashing method 'sha1'
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*
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* Uses SHA1 hashs.
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*
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* @param string $clear The clear text to hash
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* @return string Hashed password
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*/
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public function hash_sha1($clear) {
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return sha1($clear);
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}
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/**
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* Password hashing method 'ssha' as used by LDAP
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*
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* Uses salted SHA1 hashs. Salt is 4 bytes long.
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*
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* @param string $clear The clear text to hash
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* @param string $salt The salt to use, null for random
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* @return string Hashed password
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*/
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public function hash_ssha($clear, $salt = null) {
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$this->init_salt($salt, 4);
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return '{SSHA}'.base64_encode(pack("H*", sha1($clear.$salt)).$salt);
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}
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/**
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* Password hashing method 'crypt'
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*
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* Uses salted crypt hashs. Salt is 2 bytes long.
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*
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* @param string $clear The clear text to hash
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* @param string $salt The salt to use, null for random
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* @return string Hashed password
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*/
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public function hash_crypt($clear, $salt = null) {
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$this->init_salt($salt, 2);
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return crypt($clear, $salt);
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}
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/**
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* Password hashing method 'mysql'
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*
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* This method was used by old MySQL systems
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*
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* @link http://php.net/mysql
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* @author <soren at byu dot edu>
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* @param string $clear The clear text to hash
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* @return string Hashed password
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*/
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public function hash_mysql($clear) {
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$nr = 0x50305735;
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$nr2 = 0x12345671;
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$add = 7;
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$charArr = preg_split("//", $clear);
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foreach($charArr as $char) {
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if(($char == '') || ($char == ' ') || ($char == '\t')) continue;
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$charVal = ord($char);
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$nr ^= ((($nr & 63) + $add) * $charVal) + ($nr << 8);
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$nr2 += ($nr2 << 8) ^ $nr;
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$add += $charVal;
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}
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return sprintf("%08x%08x", ($nr & 0x7fffffff), ($nr2 & 0x7fffffff));
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}
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/**
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* Password hashing method 'my411'
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*
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* Uses SHA1 hashs. This method is used by MySQL 4.11 and above
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*
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* @param string $clear The clear text to hash
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* @return string Hashed password
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*/
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public function hash_my411($clear) {
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return '*'.strtoupper(sha1(pack("H*", sha1($clear))));
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}
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/**
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* Password hashing method 'kmd5'
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*
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* Uses salted MD5 hashs.
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*
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* Salt is 2 bytes long, but stored at position 16, so you need to pass at
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* least 18 bytes. You can pass the crypted hash as salt.
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*
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* @param string $clear The clear text to hash
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* @param string $salt The salt to use, null for random
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* @return string Hashed password
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*/
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public function hash_kmd5($clear, $salt = null) {
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$this->init_salt($salt);
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$key = substr($salt, 16, 2);
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$hash1 = strtolower(md5($key.md5($clear)));
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$hash2 = substr($hash1, 0, 16).$key.substr($hash1, 16);
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return $hash2;
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}
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/**
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* Password hashing method 'pmd5'
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*
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* Uses salted MD5 hashs. Salt is 1+8 bytes long, 1st byte is the
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* iteration count when given, for null salts $compute is used.
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*
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* The actual iteration count is the given count squared, maximum is
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* 30 (-> 1073741824). If a higher one is given, the function throws
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* an exception.
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*
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* @link http://www.openwall.com/phpass/
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*
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* @param string $clear The clear text to hash
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* @param string $salt The salt to use, null for random
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* @param string $magic The hash identifier (P or H)
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* @param int $compute The iteration count for new passwords
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* @throws Exception
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* @return string Hashed password
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*/
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public function hash_pmd5($clear, $salt = null, $magic = 'P', $compute = 8) {
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$itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
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if(is_null($salt)) {
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$this->init_salt($salt);
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$salt = $itoa64[$compute].$salt; // prefix iteration count
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}
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$iterc = $salt[0]; // pos 0 of salt is iteration count
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$iter = strpos($itoa64, $iterc);
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if($iter > 30) {
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throw new Exception("Too high iteration count ($iter) in ".
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__CLASS__.'::'.__FUNCTION__);
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}
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$iter = 1 << $iter;
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$salt = substr($salt, 1, 8);
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// iterate
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$hash = md5($salt.$clear, true);
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do {
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$hash = md5($hash.$clear, true);
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} while(--$iter);
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// encode
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$output = '';
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$count = 16;
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$i = 0;
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do {
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$value = ord($hash[$i++]);
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$output .= $itoa64[$value & 0x3f];
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if($i < $count)
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$value |= ord($hash[$i]) << 8;
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$output .= $itoa64[($value >> 6) & 0x3f];
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if($i++ >= $count)
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break;
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if($i < $count)
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$value |= ord($hash[$i]) << 16;
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$output .= $itoa64[($value >> 12) & 0x3f];
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if($i++ >= $count)
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break;
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$output .= $itoa64[($value >> 18) & 0x3f];
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} while($i < $count);
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return '$'.$magic.'$'.$iterc.$salt.$output;
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}
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/**
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* Alias for hash_pmd5
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*/
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public function hash_hmd5($clear, $salt = null, $magic = 'H', $compute = 8) {
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return $this->hash_pmd5($clear, $salt, $magic, $compute);
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}
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/**
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* Password hashing method 'djangosha1'
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*
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* Uses salted SHA1 hashs. Salt is 5 bytes long.
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* This is used by the Django Python framework
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*
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* @link http://docs.djangoproject.com/en/dev/topics/auth/#passwords
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*
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* @param string $clear The clear text to hash
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* @param string $salt The salt to use, null for random
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* @return string Hashed password
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*/
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public function hash_djangosha1($clear, $salt = null) {
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$this->init_salt($salt, 5);
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return 'sha1$'.$salt.'$'.sha1($salt.$clear);
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}
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/**
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* Password hashing method 'djangomd5'
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*
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* Uses salted MD5 hashs. Salt is 5 bytes long.
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* This is used by the Django Python framework
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*
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* @link http://docs.djangoproject.com/en/dev/topics/auth/#passwords
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*
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* @param string $clear The clear text to hash
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* @param string $salt The salt to use, null for random
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* @return string Hashed password
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*/
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public function hash_djangomd5($clear, $salt = null) {
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$this->init_salt($salt, 5);
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return 'md5$'.$salt.'$'.md5($salt.$clear);
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}
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/**
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* Password hashing method 'djangopbkdf2'
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*
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* An algorithm and iteration count should be given in the opts array.
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* Defaults to sha256 and 24000 iterations
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*
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* @param string $clear The clear text to hash
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* @param string $salt The salt to use, null for random
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* @param array $opts ('algo' => hash algorithm, 'iter' => iterations)
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* @return string Hashed password
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* @throws Exception when PHP is missing support for the method/algo
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*/
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public function hash_djangopbkdf2($clear, $salt=null, $opts=array()) {
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$this->init_salt($salt, 12);
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if(empty($opts['algo'])) {
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$algo = 'sha256';
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} else {
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$algo = $opts['algo'];
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}
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if(empty($opts['iter'])) {
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$iter = 24000;
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} else {
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$iter = (int) $opts['iter'];
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}
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if(!function_exists('hash_pbkdf2')) {
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throw new Exception('This PHP installation has no PBKDF2 support');
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}
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if(!in_array($algo, hash_algos())) {
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throw new Exception("This PHP installation has no $algo support");
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}
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$hash = base64_encode(hash_pbkdf2($algo, $clear, $salt, $iter, 0, true));
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return "pbkdf2_$algo\$$iter\$$salt\$$hash";
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}
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/**
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* Alias for djangopbkdf2 defaulting to sha256 as hash algorithm
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*
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* @param string $clear The clear text to hash
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* @param string $salt The salt to use, null for random
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* @param array $opts ('iter' => iterations)
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* @return string Hashed password
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* @throws Exception when PHP is missing support for the method/algo
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*/
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public function hash_djangopbkdf2_sha256($clear, $salt=null, $opts=array()) {
|
|
$opts['algo'] = 'sha256';
|
|
return $this->hash_djangopbkdf2($clear, $salt, $opts);
|
|
}
|
|
|
|
/**
|
|
* Alias for djangopbkdf2 defaulting to sha1 as hash algorithm
|
|
*
|
|
* @param string $clear The clear text to hash
|
|
* @param string $salt The salt to use, null for random
|
|
* @param array $opts ('iter' => iterations)
|
|
* @return string Hashed password
|
|
* @throws Exception when PHP is missing support for the method/algo
|
|
*/
|
|
public function hash_djangopbkdf2_sha1($clear, $salt=null, $opts=array()) {
|
|
$opts['algo'] = 'sha1';
|
|
return $this->hash_djangopbkdf2($clear, $salt, $opts);
|
|
}
|
|
|
|
/**
|
|
* Passwordhashing method 'bcrypt'
|
|
*
|
|
* Uses a modified blowfish algorithm called eksblowfish
|
|
* This method works on PHP 5.3+ only and will throw an exception
|
|
* if the needed crypt support isn't available
|
|
*
|
|
* A full hash should be given as salt (starting with $a2$) or this
|
|
* will break. When no salt is given, the iteration count can be set
|
|
* through the $compute variable.
|
|
*
|
|
* @param string $clear The clear text to hash
|
|
* @param string $salt The salt to use, null for random
|
|
* @param int $compute The iteration count (between 4 and 31)
|
|
* @throws Exception
|
|
* @return string Hashed password
|
|
*/
|
|
public function hash_bcrypt($clear, $salt = null, $compute = 8) {
|
|
if(!defined('CRYPT_BLOWFISH') || CRYPT_BLOWFISH != 1) {
|
|
throw new Exception('This PHP installation has no bcrypt support');
|
|
}
|
|
|
|
if(is_null($salt)) {
|
|
if($compute < 4 || $compute > 31) $compute = 8;
|
|
$salt = '$2a$'.str_pad($compute, 2, '0', STR_PAD_LEFT).'$'.
|
|
$this->gen_salt(22);
|
|
}
|
|
|
|
return crypt($clear, $salt);
|
|
}
|
|
|
|
/**
|
|
* Password hashing method SHA512
|
|
*
|
|
* This is only supported on PHP 5.3.2 or higher and will throw an exception if
|
|
* the needed crypt support is not available
|
|
*
|
|
* @param string $clear The clear text to hash
|
|
* @param string $salt The salt to use, null for random
|
|
* @return string Hashed password
|
|
* @throws Exception
|
|
*/
|
|
public function hash_sha512($clear, $salt = null) {
|
|
if(!defined('CRYPT_SHA512') || CRYPT_SHA512 != 1) {
|
|
throw new Exception('This PHP installation has no SHA512 support');
|
|
}
|
|
$this->init_salt($salt, 8, false);
|
|
return crypt($clear, '$6$'.$salt.'$');
|
|
}
|
|
|
|
/**
|
|
* Password hashing method 'mediawiki'
|
|
*
|
|
* Uses salted MD5, this is referred to as Method B in MediaWiki docs. Unsalted md5
|
|
* method 'A' is not supported.
|
|
*
|
|
* @link http://www.mediawiki.org/wiki/Manual_talk:User_table#user_password_column
|
|
*
|
|
* @param string $clear The clear text to hash
|
|
* @param string $salt The salt to use, null for random
|
|
* @return string Hashed password
|
|
*/
|
|
public function hash_mediawiki($clear, $salt = null) {
|
|
$this->init_salt($salt, 8, false);
|
|
return ':B:'.$salt.':'.md5($salt.'-'.md5($clear));
|
|
}
|
|
|
|
/**
|
|
* Wraps around native hash_hmac() or reimplents it
|
|
*
|
|
* This is not directly used as password hashing method, and thus isn't callable via the
|
|
* verify_hash() method. It should be used to create signatures and might be used in other
|
|
* password hashing methods.
|
|
*
|
|
* @see hash_hmac()
|
|
* @author KC Cloyd
|
|
* @link http://php.net/manual/en/function.hash-hmac.php#93440
|
|
*
|
|
* @param string $algo Name of selected hashing algorithm (i.e. "md5", "sha256", "haval160,4",
|
|
* etc..) See hash_algos() for a list of supported algorithms.
|
|
* @param string $data Message to be hashed.
|
|
* @param string $key Shared secret key used for generating the HMAC variant of the message digest.
|
|
* @param bool $raw_output When set to TRUE, outputs raw binary data. FALSE outputs lowercase hexits.
|
|
* @return string
|
|
*/
|
|
public static function hmac($algo, $data, $key, $raw_output = false) {
|
|
// use native function if available and not in unit test
|
|
if(function_exists('hash_hmac') && !defined('SIMPLE_TEST')){
|
|
return hash_hmac($algo, $data, $key, $raw_output);
|
|
}
|
|
|
|
$algo = strtolower($algo);
|
|
$pack = 'H' . strlen($algo('test'));
|
|
$size = 64;
|
|
$opad = str_repeat(chr(0x5C), $size);
|
|
$ipad = str_repeat(chr(0x36), $size);
|
|
|
|
if(strlen($key) > $size) {
|
|
$key = str_pad(pack($pack, $algo($key)), $size, chr(0x00));
|
|
} else {
|
|
$key = str_pad($key, $size, chr(0x00));
|
|
}
|
|
|
|
for($i = 0; $i < strlen($key) - 1; $i++) {
|
|
$opad[$i] = $opad[$i] ^ $key[$i];
|
|
$ipad[$i] = $ipad[$i] ^ $key[$i];
|
|
}
|
|
|
|
$output = $algo($opad . pack($pack, $algo($ipad . $data)));
|
|
|
|
return ($raw_output) ? pack($pack, $output) : $output;
|
|
}
|
|
|
|
/**
|
|
* Use DokuWiki's secure random generator if available
|
|
*
|
|
* @param int $min
|
|
* @param int $max
|
|
* @return int
|
|
*/
|
|
protected function random($min, $max){
|
|
return random_int($min, $max);
|
|
}
|
|
}
|